70592C Datasheet, PDF (59/314 Pages) Microchip Technology – High-Performance, 16-bit Microcontrollers

PIC24HJXXXGPX06A/X08A/X10A
For remapping operations, the 8-bit Program Space
Visibility register (PSVPAG) is used to define a
16K word page in the program space. When the Most
Significant bit of the EA is ‘1’, PSVPAG is concatenated
with the lower 15 bits of the EA to form a 23-bit program
space address. Unlike table operations, this limits
remapping operations strictly to the user memory area.
Table 4-35 and Figure 4-6 show how the program EA is
created for table operations and remapping accesses
from the data EA. Here, P<23:0> refers to a program
space word, whereas D<15:0> refers to a data space
word.
TABLE 4-35: PROGRAM SPACE ADDRESS CONSTRUCTION
Access Type
Access
Space
Program Space Address
<23>
<22:16>
<15>
<14:1>
<0>
Instruction Access
(Code Execution)
TBLRD/TBLWT
(Byte/Word Read/Write)
User
User
Configuration
0
PC<22:1>
0
0xxx xxxx xxxx xxxx xxxx xxx0
TBLPAG<7:0>
Data EA<15:0>
0xxx xxxx
TBLPAG<7:0>
xxxx xxxx xxxx xxxx
Data EA<15:0>
Program Space Visibility User
(Block Remap/Read)
1xxx xxxx
xxxx xxxx xxxx xxxx
0
PSVPAG<7:0>
Data EA<14:0>⁽¹⁾
0
xxxx xxxx
xxx xxxx xxxx xxxx
Note 1: Data EA<15> is always ‘1’ in this case, but is not used in calculating the program space address. Bit 15 of
the address is PSVPAG<0>.
© 2011 Microchip Technology Inc.
DS70592C-page 59